BRITISH CONCHOLOGY, 



OR AN ACCOUNT OF 



THE MOLLUSCA 



WHICH NOW INHABIT THE BRITISH ISLES AND THE 

 SURROUNDING SEAS. 



VOLUME IV. 



MARINE SHELLS, 



IX CONTINUATION OF THE GASTROPODA AS FAR AS 

 THE BULLA FAMILY. 



BY JOHN GWYN JEFFREYS, F.R.S., F.G.S., &c. 



LONDON: 



JOHN VAN VOORST, PATERNOSTER ROW. 



MDCCCLXYII. 



